Ward, Robert
Philippines Summer Institute of Linguistic Translator Philippines Publishers 1968
Buku Teks
compiled by Howard P. McKaughan, Batua A. Macaraya
University of Hawaii Press, 1967
Buku Referensi
Buku Teks
Fariz Hirzan
2015
UI - Skripsi Membership
Roberts, Ian
Oxford University Press, 2007
Buku Teks